نوع مقاله : مقاله پژوهشی فارسی

نویسندگان

گروه فناوری مواد غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان.

چکیده

هیدروژل‌ها شبکه سه‌بعدی زنجیره پلیمری با توانایی جذب زیاد آب هستند که جهت کاهش استفاده از منابع فسیلی موردتوجه قرار گرفته است. آرد فیلتر گندم محصولی اجتناب‏‌ناپذیر از طبقه‌بندی آرد تحت سیستم پنوماتیک در صنعت مدرن آسیابانی گندم می‏‌باشد. از عیوب فیلم‏‌های هیدروژلی در صنایع بسته‌‏بندی می‏‌توان به شکنندگی، نفوذپذیری بالا نسبت به آب و مقاومت کم در برابر آب اشاره کرد. از این حیث هدف این پژوهش بررسی اثر غلظت کارواکرول (5 و 10 درصد نسبت به وزن پلیمر) بر ویژگی‌‏های فیزیکی و مکانیکی، ممانعت‌کنندگی، زاویه تماس سطحی و ضدمیکروبی فیلم هیدروژلی بر پایه آرد فیلتر بود. نتایج حاصل از این پژوهش نشان داد با افزایش غلظت کارواکرول در محلول فیلم‌‏سازی، ضخامت و مقاومت به کشش افزایش و رطوبت، حلالیت در آب و کشش‌پذیری فیلم‌های هیدروژلی کاهش یافت. منافد ریز متعددی در سطح فیلم‌های حاوی کارواکرول با استفاده از تصاویر میکروسکوپ الکترونی روبشی موردتأیید قرار گرفت. بیشترین نفوذپذیری نسبت به بخار آب 10-10× 1/32 گرم مترثانیه پاسکال) و کمترین حلالیت در آب (63/0±01/37 درصد) در فیلم هیدروژلی حاوی 10 درصد کارواکرول مشاهده شد. ارزیابی فعالیت ضدمیکروبی بخارهای کارواکرول فیلم هیدروژلی در محیط جامد نشان داد که اثربخشی بخار این ترکیب علیه آسپرژیلوس نایجر (بازدارندگی کامل رشد) در مقایسه با اشرشیاکلای و لیستریامونوسایتوژنز بیشتر بود. اندیس کاهش لگاریتمی کارواکرول در غلظت 5 درصد در فیلم هیدروژلی بر پایه آرد فیلتر گندم علیه اشرشیاکلای و لیستریامونوسایتوژنز به‌ترتیب 16/1 و 34/1 لگاریتمی بود. بیشترین کاهش اندیس لگاریتمی فیلم فعال هیدروژلی در غلظت 10 درصد کارواکرول علیه لیستریامونوسایتوژنز 71/2 مشاهده شد.

کلیدواژه‌ها

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